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<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
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  <title>Document</title>
</head>

<body>
  <script>
    const countVowelSubstrings = word => {
      const len = word.length;
      if (len < 5) return 0;
      let count = 0;
      for (let i = 0; i < len; i++) {
        for (let j = i + 4; j < len; j++) {
          const arr = new Set(word.slice(i, j + 1));
          if ([...arr].sort().join('') === 'aeiou') count++;
        }
      }
      return count;
    };
    console.log(countVowelSubstrings("cuaieuouac"));
  </script>

</body>

</html>